kernel/drivers/isdn/hisax/st5481_d.c

   1 /*
   2  * Driver for ST5481 USB ISDN modem
   3  *
   4  * Author       Frode Isaksen
   5  * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
   6  *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/gfp.h>
  15 #include <linux/usb.h>
  16 #include <linux/netdevice.h>
  17 #include "st5481.h"
  18
  19 static void ph_connect(struct st5481_adapter *adapter);
  20 static void ph_disconnect(struct st5481_adapter *adapter);
  21
  22 static struct Fsm l1fsm;
  23
  24 static char *strL1State[] =
  25 {
  26         "ST_L1_F3",
  27         "ST_L1_F4",
  28         "ST_L1_F6",
  29         "ST_L1_F7",
  30         "ST_L1_F8",
  31 };
  32
  33 static char *strL1Event[] =
  34 {
  35         "EV_IND_DP",
  36         "EV_IND_1",
  37         "EV_IND_2",
  38         "EV_IND_3",
  39         "EV_IND_RSY",
  40         "EV_IND_5",
  41         "EV_IND_6",
  42         "EV_IND_7",
  43         "EV_IND_AP",
  44         "EV_IND_9",
  45         "EV_IND_10",
  46         "EV_IND_11",
  47         "EV_IND_AI8",
  48         "EV_IND_AI10",
  49         "EV_IND_AIL",
  50         "EV_IND_DI",
  51         "EV_PH_ACTIVATE_REQ",
  52         "EV_PH_DEACTIVATE_REQ",
  53         "EV_TIMER3",
  54 };
  55
  56 static inline void D_L1L2(struct st5481_adapter *adapter, int pr, void *arg)
  57 {
  58         struct hisax_if *ifc = (struct hisax_if *) &adapter->hisax_d_if;
  59
  60         ifc->l1l2(ifc, pr, arg);
  61 }
  62
  63 static void
  64 l1_go_f3(struct FsmInst *fi, int event, void *arg)
  65 {
  66         struct st5481_adapter *adapter = fi->userdata;
  67
  68         if (fi->state == ST_L1_F7)
  69                 ph_disconnect(adapter);
  70
  71         FsmChangeState(fi, ST_L1_F3);
  72         D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
  73 }
  74
  75 static void
  76 l1_go_f6(struct FsmInst *fi, int event, void *arg)
  77 {
  78         struct st5481_adapter *adapter = fi->userdata;
  79
  80         if (fi->state == ST_L1_F7)
  81                 ph_disconnect(adapter);
  82
  83         FsmChangeState(fi, ST_L1_F6);
  84 }
  85
  86 static void
  87 l1_go_f7(struct FsmInst *fi, int event, void *arg)
  88 {
  89         struct st5481_adapter *adapter = fi->userdata;
  90
  91         FsmDelTimer(&adapter->timer, 0);
  92         ph_connect(adapter);
  93         FsmChangeState(fi, ST_L1_F7);
  94         D_L1L2(adapter, PH_ACTIVATE | INDICATION, NULL);
  95 }
  96
  97 static void
  98 l1_go_f8(struct FsmInst *fi, int event, void *arg)
  99 {
 100         struct st5481_adapter *adapter = fi->userdata;
 101
 102         if (fi->state == ST_L1_F7)
 103                 ph_disconnect(adapter);
 104
 105         FsmChangeState(fi, ST_L1_F8);
 106 }
 107
 108 static void
 109 l1_timer3(struct FsmInst *fi, int event, void *arg)
 110 {
 111         struct st5481_adapter *adapter = fi->userdata;
 112
 113         st5481_ph_command(adapter, ST5481_CMD_DR);
 114         FsmChangeState(fi, ST_L1_F3);
 115         D_L1L2(adapter, PH_DEACTIVATE | INDICATION, NULL);
 116 }
 117
 118 static void
 119 l1_ignore(struct FsmInst *fi, int event, void *arg)
 120 {
 121 }
 122
 123 static void
 124 l1_activate(struct FsmInst *fi, int event, void *arg)
 125 {
 126         struct st5481_adapter *adapter = fi->userdata;
 127
 128         st5481_ph_command(adapter, ST5481_CMD_DR);
 129         st5481_ph_command(adapter, ST5481_CMD_PUP);
 130         FsmRestartTimer(&adapter->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
 131         st5481_ph_command(adapter, ST5481_CMD_AR8);
 132         FsmChangeState(fi, ST_L1_F4);
 133 }
 134
 135 static struct FsmNode L1FnList[] __initdata =
 136 {
 137         {ST_L1_F3, EV_IND_DP,            l1_ignore},
 138         {ST_L1_F3, EV_IND_AP,            l1_go_f6},
 139         {ST_L1_F3, EV_IND_AI8,           l1_go_f7},
 140         {ST_L1_F3, EV_IND_AI10,          l1_go_f7},
 141         {ST_L1_F3, EV_PH_ACTIVATE_REQ,   l1_activate},
 142
 143         {ST_L1_F4, EV_TIMER3,            l1_timer3},
 144         {ST_L1_F4, EV_IND_DP,            l1_go_f3},
 145         {ST_L1_F4, EV_IND_AP,            l1_go_f6},
 146         {ST_L1_F4, EV_IND_AI8,           l1_go_f7},
 147         {ST_L1_F4, EV_IND_AI10,          l1_go_f7},
 148
 149         {ST_L1_F6, EV_TIMER3,            l1_timer3},
 150         {ST_L1_F6, EV_IND_DP,            l1_go_f3},
 151         {ST_L1_F6, EV_IND_AP,            l1_ignore},
 152         {ST_L1_F6, EV_IND_AI8,           l1_go_f7},
 153         {ST_L1_F6, EV_IND_AI10,          l1_go_f7},
 154         {ST_L1_F7, EV_IND_RSY,           l1_go_f8},
 155
 156         {ST_L1_F7, EV_IND_DP,            l1_go_f3},
 157         {ST_L1_F7, EV_IND_AP,            l1_go_f6},
 158         {ST_L1_F7, EV_IND_AI8,           l1_ignore},
 159         {ST_L1_F7, EV_IND_AI10,          l1_ignore},
 160         {ST_L1_F7, EV_IND_RSY,           l1_go_f8},
 161
 162         {ST_L1_F8, EV_TIMER3,            l1_timer3},
 163         {ST_L1_F8, EV_IND_DP,            l1_go_f3},
 164         {ST_L1_F8, EV_IND_AP,            l1_go_f6},
 165         {ST_L1_F8, EV_IND_AI8,           l1_go_f8},
 166         {ST_L1_F8, EV_IND_AI10,          l1_go_f8},
 167         {ST_L1_F8, EV_IND_RSY,           l1_ignore},
 168 };
 169
 170 static __printf(2, 3)
 171         void l1m_debug(struct FsmInst *fi, char *fmt, ...)
 172 {
 173         va_list args;
 174         char buf[256];
 175
 176         va_start(args, fmt);
 177         vsnprintf(buf, sizeof(buf), fmt, args);
 178         DBG(8, "%s", buf);
 179         va_end(args);
 180 }
 181
 182 /* ======================================================================
 183  * D-Channel out
 184  */
 185
 186 /*
 187   D OUT state machine:
 188   ====================
 189
 190   Transmit short frame (< 16 bytes of encoded data):
 191
 192   L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
 193   --------    -----------           ---                  ---------
 194
 195   FIXME
 196
 197   -> [xx..xx]  SHORT_INIT            -> [7Exx..xxC1C27EFF]
 198   SHORT_WAIT_DEN        <> OUT_D_COUNTER=16
 199
 200   END_OF_SHORT          <- DEN_EVENT         -> 7Exx
 201   xxxx
 202   xxxx
 203   xxxx
 204   xxxx
 205   xxxx
 206   C1C1
 207   7EFF
 208   WAIT_FOR_RESET_IDLE   <- D_UNDERRUN        <- (8ms)
 209   IDLE                  <> Reset pipe
 210
 211
 212
 213   Transmit long frame (>= 16 bytes of encoded data):
 214
 215   L1 FRAME    D_OUT_STATE           USB                  D CHANNEL
 216   --------    -----------           ---                  ---------
 217
 218   -> [xx...xx] IDLE
 219   WAIT_FOR_STOP         <> OUT_D_COUNTER=0
 220   WAIT_FOR_RESET        <> Reset pipe
 221   STOP
 222   INIT_LONG_FRAME       -> [7Exx..xx]
 223   WAIT_DEN              <> OUT_D_COUNTER=16
 224   OUT_NORMAL            <- DEN_EVENT       -> 7Exx
 225   END_OF_FRAME_BUSY     -> [xxxx]             xxxx
 226   END_OF_FRAME_NOT_BUSY -> [xxxx]             xxxx
 227   -> [xxxx]               xxxx
 228   -> [C1C2]               xxxx
 229   -> [7EFF]               xxxx
 230   xxxx
 231   xxxx
 232   ....
 233   xxxx
 234   C1C2
 235   7EFF
 236   <- D_UNDERRUN      <- (> 8ms)
 237   WAIT_FOR_STOP         <> OUT_D_COUNTER=0
 238   WAIT_FOR_RESET        <> Reset pipe
 239   STOP
 240
 241 */
 242
 243 static struct Fsm dout_fsm;
 244
 245 static char *strDoutState[] =
 246 {
 247         "ST_DOUT_NONE",
 248
 249         "ST_DOUT_SHORT_INIT",
 250         "ST_DOUT_SHORT_WAIT_DEN",
 251
 252         "ST_DOUT_LONG_INIT",
 253         "ST_DOUT_LONG_WAIT_DEN",
 254         "ST_DOUT_NORMAL",
 255
 256         "ST_DOUT_WAIT_FOR_UNDERRUN",
 257         "ST_DOUT_WAIT_FOR_NOT_BUSY",
 258         "ST_DOUT_WAIT_FOR_STOP",
 259         "ST_DOUT_WAIT_FOR_RESET",
 260 };
 261
 262 static char *strDoutEvent[] =
 263 {
 264         "EV_DOUT_START_XMIT",
 265         "EV_DOUT_COMPLETE",
 266         "EV_DOUT_DEN",
 267         "EV_DOUT_RESETED",
 268         "EV_DOUT_STOPPED",
 269         "EV_DOUT_COLL",
 270         "EV_DOUT_UNDERRUN",
 271 };
 272
 273 static __printf(2, 3)
 274         void dout_debug(struct FsmInst *fi, char *fmt, ...)
 275 {
 276         va_list args;
 277         char buf[256];
 278
 279         va_start(args, fmt);
 280         vsnprintf(buf, sizeof(buf), fmt, args);
 281         DBG(0x2, "%s", buf);
 282         va_end(args);
 283 }
 284
 285 static void dout_stop_event(void *context)
 286 {
 287         struct st5481_adapter *adapter = context;
 288
 289         FsmEvent(&adapter->d_out.fsm, EV_DOUT_STOPPED, NULL);
 290 }
 291
 292 /*
 293  * Start the transfer of a D channel frame.
 294  */
 295 static void usb_d_out(struct st5481_adapter *adapter, int buf_nr)
 296 {
 297         struct st5481_d_out *d_out = &adapter->d_out;
 298         struct urb *urb;
 299         unsigned int num_packets, packet_offset;
 300         int len, buf_size, bytes_sent;
 301         struct sk_buff *skb;
 302         struct usb_iso_packet_descriptor *desc;
 303
 304         if (d_out->fsm.state != ST_DOUT_NORMAL)
 305                 return;
 306
 307         if (test_and_set_bit(buf_nr, &d_out->busy)) {
 308                 DBG(2, "ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
 309                 return;
 310         }
 311         urb = d_out->urb[buf_nr];
 312
 313         skb = d_out->tx_skb;
 314
 315         buf_size = NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT;
 316
 317         if (skb) {
 318                 len = isdnhdlc_encode(&d_out->hdlc_state,
 319                                       skb->data, skb->len, &bytes_sent,
 320                                       urb->transfer_buffer, buf_size);
 321                 skb_pull(skb, bytes_sent);
 322         } else {
 323                 // Send flags or idle
 324                 len = isdnhdlc_encode(&d_out->hdlc_state,
 325                                       NULL, 0, &bytes_sent,
 326                                       urb->transfer_buffer, buf_size);
 327         }
 328
 329         if (len < buf_size) {
 330                 FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
 331         }
 332         if (skb && !skb->len) {
 333                 d_out->tx_skb = NULL;
 334                 D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
 335                 dev_kfree_skb_any(skb);
 336         }
 337
 338         // Prepare the URB
 339         urb->transfer_buffer_length = len;
 340         num_packets = 0;
 341         packet_offset = 0;
 342         while (packet_offset < len) {
 343                 desc = &urb->iso_frame_desc[num_packets];
 344                 desc->offset = packet_offset;
 345                 desc->length = SIZE_ISO_PACKETS_D_OUT;
 346                 if (len - packet_offset < desc->length)
 347                         desc->length = len - packet_offset;
 348                 num_packets++;
 349                 packet_offset += desc->length;
 350         }
 351         urb->number_of_packets = num_packets;
 352
 353         // Prepare the URB
 354         urb->dev = adapter->usb_dev;
 355         // Need to transmit the next buffer 2ms after the DEN_EVENT
 356         urb->transfer_flags = 0;
 357         urb->start_frame = usb_get_current_frame_number(adapter->usb_dev) + 2;
 358
 359         DBG_ISO_PACKET(0x20, urb);
 360
 361         if (usb_submit_urb(urb, GFP_KERNEL) < 0) {
 362                 // There is another URB queued up
 363                 urb->transfer_flags = URB_ISO_ASAP;
 364                 SUBMIT_URB(urb, GFP_KERNEL);
 365         }
 366 }
 367
 368 static void fifo_reseted(void *context)
 369 {
 370         struct st5481_adapter *adapter = context;
 371
 372         FsmEvent(&adapter->d_out.fsm, EV_DOUT_RESETED, NULL);
 373 }
 374
 375 static void usb_d_out_complete(struct urb *urb)
 376 {
 377         struct st5481_adapter *adapter = urb->context;
 378         struct st5481_d_out *d_out = &adapter->d_out;
 379         long buf_nr;
 380
 381         DBG(2, "");
 382
 383         buf_nr = get_buf_nr(d_out->urb, urb);
 384         test_and_clear_bit(buf_nr, &d_out->busy);
 385
 386         if (unlikely(urb->status < 0)) {
 387                 switch (urb->status) {
 388                 case -ENOENT:
 389                 case -ESHUTDOWN:
 390                 case -ECONNRESET:
 391                         DBG(1, "urb killed status %d", urb->status);
 392                         break;
 393                 default:
 394                         WARNING("urb status %d", urb->status);
 395                         if (d_out->busy == 0) {
 396                                 st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
 397                         }
 398                         break;
 399                 }
 400                 return; // Give up
 401         }
 402
 403         FsmEvent(&adapter->d_out.fsm, EV_DOUT_COMPLETE, (void *) buf_nr);
 404 }
 405
 406 /* ====================================================================== */
 407
 408 static void dout_start_xmit(struct FsmInst *fsm, int event, void *arg)
 409 {
 410         // FIXME unify?
 411         struct st5481_adapter *adapter = fsm->userdata;
 412         struct st5481_d_out *d_out = &adapter->d_out;
 413         struct urb *urb;
 414         int len, bytes_sent;
 415         struct sk_buff *skb;
 416         int buf_nr = 0;
 417
 418         skb = d_out->tx_skb;
 419
 420         DBG(2, "len=%d", skb->len);
 421
 422         isdnhdlc_out_init(&d_out->hdlc_state, HDLC_DCHANNEL | HDLC_BITREVERSE);
 423
 424         if (test_and_set_bit(buf_nr, &d_out->busy)) {
 425                 WARNING("ep %d urb %d busy %#lx", EP_D_OUT, buf_nr, d_out->busy);
 426                 return;
 427         }
 428         urb = d_out->urb[buf_nr];
 429
 430         DBG_SKB(0x10, skb);
 431         len = isdnhdlc_encode(&d_out->hdlc_state,
 432                               skb->data, skb->len, &bytes_sent,
 433                               urb->transfer_buffer, 16);
 434         skb_pull(skb, bytes_sent);
 435
 436         if (len < 16)
 437                 FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_INIT);
 438         else
 439                 FsmChangeState(&d_out->fsm, ST_DOUT_LONG_INIT);
 440
 441         if (skb->len == 0) {
 442                 d_out->tx_skb = NULL;
 443                 D_L1L2(adapter, PH_DATA | CONFIRM, NULL);
 444                 dev_kfree_skb_any(skb);
 445         }
 446
 447 // Prepare the URB
 448         urb->transfer_buffer_length = len;
 449
 450         urb->iso_frame_desc[0].offset = 0;
 451         urb->iso_frame_desc[0].length = len;
 452         urb->number_of_packets = 1;
 453
 454         // Prepare the URB
 455         urb->dev = adapter->usb_dev;
 456         urb->transfer_flags = URB_ISO_ASAP;
 457
 458         DBG_ISO_PACKET(0x20, urb);
 459         SUBMIT_URB(urb, GFP_KERNEL);
 460 }
 461
 462 static void dout_short_fifo(struct FsmInst *fsm, int event, void *arg)
 463 {
 464         struct st5481_adapter *adapter = fsm->userdata;
 465         struct st5481_d_out *d_out = &adapter->d_out;
 466
 467         FsmChangeState(&d_out->fsm, ST_DOUT_SHORT_WAIT_DEN);
 468         st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
 469 }
 470
 471 static void dout_end_short_frame(struct FsmInst *fsm, int event, void *arg)
 472 {
 473         struct st5481_adapter *adapter = fsm->userdata;
 474         struct st5481_d_out *d_out = &adapter->d_out;
 475
 476         FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_UNDERRUN);
 477 }
 478
 479 static void dout_long_enable_fifo(struct FsmInst *fsm, int event, void *arg)
 480 {
 481         struct st5481_adapter *adapter = fsm->userdata;
 482         struct st5481_d_out *d_out = &adapter->d_out;
 483
 484         st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 16, NULL, NULL);
 485         FsmChangeState(&d_out->fsm, ST_DOUT_LONG_WAIT_DEN);
 486 }
 487
 488 static void dout_long_den(struct FsmInst *fsm, int event, void *arg)
 489 {
 490         struct st5481_adapter *adapter = fsm->userdata;
 491         struct st5481_d_out *d_out = &adapter->d_out;
 492
 493         FsmChangeState(&d_out->fsm, ST_DOUT_NORMAL);
 494         usb_d_out(adapter, 0);
 495         usb_d_out(adapter, 1);
 496 }
 497
 498 static void dout_reset(struct FsmInst *fsm, int event, void *arg)
 499 {
 500         struct st5481_adapter *adapter = fsm->userdata;
 501         struct st5481_d_out *d_out = &adapter->d_out;
 502
 503         FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_RESET);
 504         st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, fifo_reseted, adapter);
 505 }
 506
 507 static void dout_stop(struct FsmInst *fsm, int event, void *arg)
 508 {
 509         struct st5481_adapter *adapter = fsm->userdata;
 510         struct st5481_d_out *d_out = &adapter->d_out;
 511
 512         FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_STOP);
 513         st5481_usb_device_ctrl_msg(adapter, OUT_D_COUNTER, 0, dout_stop_event, adapter);
 514 }
 515
 516 static void dout_underrun(struct FsmInst *fsm, int event, void *arg)
 517 {
 518         struct st5481_adapter *adapter = fsm->userdata;
 519         struct st5481_d_out *d_out = &adapter->d_out;
 520
 521         if (test_bit(0, &d_out->busy) || test_bit(1, &d_out->busy)) {
 522                 FsmChangeState(&d_out->fsm, ST_DOUT_WAIT_FOR_NOT_BUSY);
 523         }  else {
 524                 dout_stop(fsm, event, arg);
 525         }
 526 }
 527
 528 static void dout_check_busy(struct FsmInst *fsm, int event, void *arg)
 529 {
 530         struct st5481_adapter *adapter = fsm->userdata;
 531         struct st5481_d_out *d_out = &adapter->d_out;
 532
 533         if (!test_bit(0, &d_out->busy) && !test_bit(1, &d_out->busy))
 534                 dout_stop(fsm, event, arg);
 535 }
 536
 537 static void dout_reseted(struct FsmInst *fsm, int event, void *arg)
 538 {
 539         struct st5481_adapter *adapter = fsm->userdata;
 540         struct st5481_d_out *d_out = &adapter->d_out;
 541
 542         FsmChangeState(&d_out->fsm, ST_DOUT_NONE);
 543         // FIXME locking
 544         if (d_out->tx_skb)
 545                 FsmEvent(&d_out->fsm, EV_DOUT_START_XMIT, NULL);
 546 }
 547
 548 static void dout_complete(struct FsmInst *fsm, int event, void *arg)
 549 {
 550         struct st5481_adapter *adapter = fsm->userdata;
 551         long buf_nr = (long) arg;
 552
 553         usb_d_out(adapter, buf_nr);
 554 }
 555
 556 static void dout_ignore(struct FsmInst *fsm, int event, void *arg)
 557 {
 558 }
 559
 560 static struct FsmNode DoutFnList[] __initdata =
 561 {
 562         {ST_DOUT_NONE,                   EV_DOUT_START_XMIT,   dout_start_xmit},
 563
 564         {ST_DOUT_SHORT_INIT,             EV_DOUT_COMPLETE,     dout_short_fifo},
 565
 566         {ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_DEN,          dout_end_short_frame},
 567         {ST_DOUT_SHORT_WAIT_DEN,         EV_DOUT_UNDERRUN,     dout_underrun},
 568
 569         {ST_DOUT_LONG_INIT,              EV_DOUT_COMPLETE,     dout_long_enable_fifo},
 570
 571         {ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_DEN,          dout_long_den},
 572         {ST_DOUT_LONG_WAIT_DEN,          EV_DOUT_UNDERRUN,     dout_underrun},
 573
 574         {ST_DOUT_NORMAL,                 EV_DOUT_UNDERRUN,     dout_underrun},
 575         {ST_DOUT_NORMAL,                 EV_DOUT_COMPLETE,     dout_complete},
 576
 577         {ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_UNDERRUN,     dout_underrun},
 578         {ST_DOUT_WAIT_FOR_UNDERRUN,      EV_DOUT_COMPLETE,     dout_ignore},
 579
 580         {ST_DOUT_WAIT_FOR_NOT_BUSY,      EV_DOUT_COMPLETE,     dout_check_busy},
 581
 582         {ST_DOUT_WAIT_FOR_STOP,          EV_DOUT_STOPPED,      dout_reset},
 583
 584         {ST_DOUT_WAIT_FOR_RESET,         EV_DOUT_RESETED,      dout_reseted},
 585 };
 586
 587 void st5481_d_l2l1(struct hisax_if *hisax_d_if, int pr, void *arg)
 588 {
 589         struct st5481_adapter *adapter = hisax_d_if->priv;
 590         struct sk_buff *skb = arg;
 591
 592         switch (pr) {
 593         case PH_ACTIVATE | REQUEST:
 594                 FsmEvent(&adapter->l1m, EV_PH_ACTIVATE_REQ, NULL);
 595                 break;
 596         case PH_DEACTIVATE | REQUEST:
 597                 FsmEvent(&adapter->l1m, EV_PH_DEACTIVATE_REQ, NULL);
 598                 break;
 599         case PH_DATA | REQUEST:
 600                 DBG(2, "PH_DATA REQUEST len %d", skb->len);
 601                 BUG_ON(adapter->d_out.tx_skb);
 602                 adapter->d_out.tx_skb = skb;
 603                 FsmEvent(&adapter->d_out.fsm, EV_DOUT_START_XMIT, NULL);
 604                 break;
 605         default:
 606                 WARNING("pr %#x\n", pr);
 607                 break;
 608         }
 609 }
 610
 611 /* ======================================================================
 612  */
 613
 614 /*
 615  * Start receiving on the D channel since entered state F7.
 616  */
 617 static void ph_connect(struct st5481_adapter *adapter)
 618 {
 619         struct st5481_d_out *d_out = &adapter->d_out;
 620         struct st5481_in *d_in = &adapter->d_in;
 621
 622         DBG(8, "");
 623
 624         FsmChangeState(&d_out->fsm, ST_DOUT_NONE);
 625
 626         //      st5481_usb_device_ctrl_msg(adapter, FFMSK_D, OUT_UNDERRUN, NULL, NULL);
 627         st5481_usb_device_ctrl_msg(adapter, FFMSK_D, 0xfc, NULL, NULL);
 628         st5481_in_mode(d_in, L1_MODE_HDLC);
 629
 630 #ifdef LOOPBACK
 631         // Turn loopback on (data sent on B and D looped back)
 632         st5481_usb_device_ctrl_msg(cs, LBB, 0x04, NULL, NULL);
 633 #endif
 634
 635         st5481_usb_pipe_reset(adapter, EP_D_OUT | USB_DIR_OUT, NULL, NULL);
 636
 637         // Turn on the green LED to tell that we are in state F7
 638         adapter->leds |= GREEN_LED;
 639         st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
 640 }
 641
 642 /*
 643  * Stop receiving on the D channel since not in state F7.
 644  */
 645 static void ph_disconnect(struct st5481_adapter *adapter)
 646 {
 647         DBG(8, "");
 648
 649         st5481_in_mode(&adapter->d_in, L1_MODE_NULL);
 650
 651         // Turn off the green LED to tell that we left state F7
 652         adapter->leds &= ~GREEN_LED;
 653         st5481_usb_device_ctrl_msg(adapter, GPIO_OUT, adapter->leds, NULL, NULL);
 654 }
 655
 656 static int st5481_setup_d_out(struct st5481_adapter *adapter)
 657 {
 658         struct usb_device *dev = adapter->usb_dev;
 659         struct usb_interface *intf;
 660         struct usb_host_interface *altsetting = NULL;
 661         struct usb_host_endpoint *endpoint;
 662         struct st5481_d_out *d_out = &adapter->d_out;
 663
 664         DBG(2, "");
 665
 666         intf = usb_ifnum_to_if(dev, 0);
 667         if (intf)
 668                 altsetting = usb_altnum_to_altsetting(intf, 3);
 669         if (!altsetting)
 670                 return -ENXIO;
 671
 672         // Allocate URBs and buffers for the D channel out
 673         endpoint = &altsetting->endpoint[EP_D_OUT-1];
 674
 675         DBG(2, "endpoint address=%02x,packet size=%d",
 676             endpoint->desc.bEndpointAddress, le16_to_cpu(endpoint->desc.wMaxPacketSize));
 677
 678         return st5481_setup_isocpipes(d_out->urb, dev,
 679                                       usb_sndisocpipe(dev, endpoint->desc.bEndpointAddress),
 680                                       NUM_ISO_PACKETS_D, SIZE_ISO_PACKETS_D_OUT,
 681                                       NUM_ISO_PACKETS_D * SIZE_ISO_PACKETS_D_OUT,
 682                                       usb_d_out_complete, adapter);
 683 }
 684
 685 static void st5481_release_d_out(struct st5481_adapter *adapter)
 686 {
 687         struct st5481_d_out *d_out = &adapter->d_out;
 688
 689         DBG(2, "");
 690
 691         st5481_release_isocpipes(d_out->urb);
 692 }
 693
 694 int st5481_setup_d(struct st5481_adapter *adapter)
 695 {
 696         int retval;
 697
 698         DBG(2, "");
 699
 700         retval = st5481_setup_d_out(adapter);
 701         if (retval)
 702                 goto err;
 703         adapter->d_in.bufsize = MAX_DFRAME_LEN_L1;
 704         adapter->d_in.num_packets = NUM_ISO_PACKETS_D;
 705         adapter->d_in.packet_size = SIZE_ISO_PACKETS_D_IN;
 706         adapter->d_in.ep = EP_D_IN | USB_DIR_IN;
 707         adapter->d_in.counter = IN_D_COUNTER;
 708         adapter->d_in.adapter = adapter;
 709         adapter->d_in.hisax_if = &adapter->hisax_d_if.ifc;
 710         retval = st5481_setup_in(&adapter->d_in);
 711         if (retval)
 712                 goto err_d_out;
 713
 714         adapter->l1m.fsm = &l1fsm;
 715         adapter->l1m.state = ST_L1_F3;
 716         adapter->l1m.debug = st5481_debug & 0x100;
 717         adapter->l1m.userdata = adapter;
 718         adapter->l1m.printdebug = l1m_debug;
 719         FsmInitTimer(&adapter->l1m, &adapter->timer);
 720
 721         adapter->d_out.fsm.fsm = &dout_fsm;
 722         adapter->d_out.fsm.state = ST_DOUT_NONE;
 723         adapter->d_out.fsm.debug = st5481_debug & 0x100;
 724         adapter->d_out.fsm.userdata = adapter;
 725         adapter->d_out.fsm.printdebug = dout_debug;
 726
 727         return 0;
 728
 729 err_d_out:
 730         st5481_release_d_out(adapter);
 731 err:
 732         return retval;
 733 }
 734
 735 void st5481_release_d(struct st5481_adapter *adapter)
 736 {
 737         DBG(2, "");
 738
 739         st5481_release_in(&adapter->d_in);
 740         st5481_release_d_out(adapter);
 741 }
 742
 743 /* ======================================================================
 744  * init / exit
 745  */
 746
 747 int __init st5481_d_init(void)
 748 {
 749         int retval;
 750
 751         l1fsm.state_count = L1_STATE_COUNT;
 752         l1fsm.event_count = L1_EVENT_COUNT;
 753         l1fsm.strEvent = strL1Event;
 754         l1fsm.strState = strL1State;
 755         retval = FsmNew(&l1fsm, L1FnList, ARRAY_SIZE(L1FnList));
 756         if (retval)
 757                 goto err;
 758
 759         dout_fsm.state_count = DOUT_STATE_COUNT;
 760         dout_fsm.event_count = DOUT_EVENT_COUNT;
 761         dout_fsm.strEvent = strDoutEvent;
 762         dout_fsm.strState = strDoutState;
 763         retval = FsmNew(&dout_fsm, DoutFnList, ARRAY_SIZE(DoutFnList));
 764         if (retval)
 765                 goto err_l1;
 766
 767         return 0;
 768
 769 err_l1:
 770         FsmFree(&l1fsm);
 771 err:
 772         return retval;
 773 }
 774
 775 // can't be __exit
 776 void st5481_d_exit(void)
 777 {
 778         FsmFree(&l1fsm);
 779         FsmFree(&dout_fsm);
 780 }